Tapping tool



Aug- 19, 1952 J. STARKEL 2,607,055

TAPPING TOOL Filed May 5, 1947 IN VEN TOR.

Patented Aug. 19, 1952 3 ;"5ilafim5' l lThisi-invention pertal-'ns'to a machineztool, and more particularly to a tapping tool and thelike.

In many instances when threads must `fbe ap- \.p1ied.to f-azvworkepieccfthey must-:be applied manually with a `tapping ftool. Y-znless the .-.tool Sis carefully :handled .athene-ais.` dangerV that :the ftap Swillabecoxne .fdamagellzor.:brokenJ even where wa' pilotlhole.is:rst.made,rasshy; a drill, Lthusv causvin'gunnecessaryfdelay;andeexpense.

`:It-iis, thereiore, anfnb' eetcof thisainventionfato fprnvide an inexpensive rtanping 15001; whieh emay `be used with fthe :toolemakingthemilot -hole in -the workrfpizecefto; heathreaderkithusin rinefthat the path';o f ethetap fwllvfollorvithesizlath.I Vcfetlfife @ole-making the pilot -r vAnotherf QlQieet foi? atappir1et0o1fwl1i9h S.

Gatien is to prqvide xpensiveilleeedand n in. l

iS t9 iPrOYde an De'llsd vrneribersl A isf-tof-proyide l Epping. tool which. A adapted vtofb'e car- `rie d V in a relatively,small..comenientgpaclageyet-911e :which providesadequateleizeraee .llse .fforteasy operation AothenobiectMirthe .investiga/is to provide a .tapping tool fwhhjsgsirriplefandlruggem@31d wherein the wearing y narts,v are reduced Mr to a minimum.

' Withithese anidraripusbtherQbiets View, the.imzentipn 1c9nssts;of, e. .ain navel ,features of construction Qperatrlas will be more Yfully releseriloed and Particillarly P ted .out in the Specmeatiolt "drawings :and'lalmsi appended hereto. 4 V 'L j In the drawings, which illustrate embo'cl iments -of-v the `device --wherein flike `-k;revferencechar acterse're :usedtfdesenatelikezparw- Figure lfis 'a ireementaliy elevationef. a drill press'havine 'a tapp'newol embodying 'the 'in- ".Feulre' anienleteedffragmentary. elevation @fthe-assembled: tappinetoOl-fembodyne:the invention;

'Figure Swisfan enlargedjragnrentaryelevation ^of the-tap endmortinfof'thetappingtqoleillustrated {ini Figure Zthe same bein'g #taken sub- -stantially fin-f the plane as indicated byethe 'fline `3`f-3ofi-Stig-ure2; Y Y l Y 1Figure4 is-'an eri-pleded,.f`ragmentary,'sectional l`elevation fofportions of the tappi-ng tool embod-yingthe invention; the-elevation bein'geta-ken 'atlthcftap.zendlrqfrtheftool; 2 i: Figure-"F5 l"is :an enlargedsectionaleplan f-view 1947seria1 NQ. 745,749

(CLM- 1517) `taken :substa'ritially. :1i-ni the 'plane as indicatedlby fthe 11ine f5`-;5of JFigure '13;

lFigur'e e6 reis-an `enlarged,sectional Vplan.` View -ltaken substantially in thebplaneasaindicated by 5 -the rlinel-"i-fof Figure :3 and Fi ure 17 'issan lenlarged, sectional vplanwiew taken substantially in.: the plane asindicated-by the -line 'i1-.#1 of :Figurel Theetapping tool :illustrated -colsnprises the -relatvely--xed :cylindrical pivotibare or rod l0, the -upper or chuck fend lli-2:01? vwhich is adapted to be secured in the chuckfliL-o'far-machine, such as the fr drill -press il 6 illustrated ein-Figure y1, the chuckbeing a'dapte'dito fbev raised.4 and lowered in 1-5 hthe:conventional@manner bythe handle :18. It Lis, of .course, understood .that the Atapping .tool --may be:.used,inotheriforms?oft-machines, thefd-rill .fprcssiloeing'zherein illustrated merely by way Aof example. v ---';The: lower or ;ta-'p. end20fof.1the-barL0 iseshoulldered or cut ,awayias at 22 kproviding theK cylindrical portion :Zilwhichlinergcsinto the Af-rustoconical portion lproyi'dedeat .-its extremity with :the substantially spherical-forrrourided portion 8. .25 {Ihe :junction orv ridg betweenportions 26.an;d @Seissubstantiallyfofiithe samediameter as .the

diameter'of racial-,0,y -Ihus a guiding and .pivotf ingereeesse-S (L is provided at the. end 2 0 of .the bargl. 30 'iT-heirotatablebody;membcraz-.is provided with the r111101991*:tnbllla-r :member 3 4, A#having an inner diameter slightlygreater ;thanfthe .outer diametera 0ftthenar:lewhercbyfpivotal movement with pfefelllbly; :Small -tolerance had .between the y .-bQdY.; memberzL-andgbar ..-I 0 when in -assembled illn.

The t,tubnlar1 men:lber ontube 3341 isc-provided wthzthe f cressebar.. or Qperatinghead 35 nter.- :naI-Iy-ithreadedQas :at238 land; dal Jfor receivingbor- T4,0 :responding male5threacled. members F42 and d'4 ron:v the .remcvablezhandles 4.'6 .and r4 8, said handles being identical and of l suicient. length to pro- Vide adequate leverage for operationof-'thetool eThezheadszis :formedlintegral withf is :bra-Zed,

45 welcle'cleorfotherwise-.suitably;secured 5 tofthe: tube 34. The lower.ortapj end fofvltheviubeill vis :shouldered zas :a1-,miras fby. cutting.awayA a-rpart of the-send `oftsaid ;tube, zandz, theftubeis :formed: in ategralwit-h,fisLA brazed, :.,weldedl or otherwise` suiti5 0 u ablszisecu-redto thezlowerisockemmemberg.

' s ocketrmember'f andthe tube f Sl .are :aperturegleasat LT52 andthe socket membersf5 0 is tanerturedtas-at ,nsaid apertures b eing 4in ,ver- -lticalalignmentendoeingadaptedgtorespectively 5,55 receive the -inwardlyf extendinglugsflland 158,

said lugs being spring pressed inwardly by the leaf spring 60 to the ends of which said lugs are secured, said spring being secured intermediate the ends thereof as at 52 to the socket member 50.

A cylindrical adapter 64 is provided for receiving a tap, bit or other member 66, the upper end of the adapter 64 being shouldered as at 68 to provide a lug similar to lug 38 whereby when the adapter, the outer diameter of which is slightly less than the inner diameter of the member 50, is inserted in the member B, shoulders 68 and 36 will interlock as shown in Figure 3, the adapter being provided with the notch 'I0 adapted to receive the lug 58 whenin applied position, whereby the tap 66 is releasably secured to the body member 32. i

.As an illustration of the use of the herein described tool, let it be assumed that the drill press I6 has been utilized to drill a small pilot hole in a work piece (not shown) the pilot hole to be later used for guiding atapping tool 66 for threading the work piece. The 'drill is removed from the chuck l 4 whichv is moved-to raised position. The handles 46 and 48 are applied to the cross bar 35Y and the bar I0 is inserted in the upper part of tube 34 until the lug 56 is in engagement with the recess 30. As the lug 56 is near the tap end Yof the body member 32 a long bearingvis provided between the bar I0 and the body member, tending always to maintain axial alignment.

The adapter 64 provided with the tap 56 is inserted in the socket member 50 in the position illustrated in Figure 3, where the shoulders 3S and 68 interlock and the lug 58 is received in the notch 18. Adapter `64 and body 32 being nonrotatably connected results in axial alignment of the tool and tap being maintained at all times. The tapping tool thus assembled is than applied to the chuck so that the upper end I2 of bar I0 is secured in the chuck I4. The handle I8 can then be operated to lower the tapping tool 66 until it is adjacent the pilot hole of the work piece. The exact distance of the tap from the pilot hole is a matter of choice, but it has been found convenient to have enough clearance so that if it is necessary to change a tap, there is room enough to do so without operation of handle i8. Where the handle I3 is set so room is provided, the adapter B4 may be `pulled downwardly and disengaged from the socket 50 without'having to change the position of the drill press I6, and a new tap 66 may be applied.

With the tap in this raised position, downward pressure on the handles 46 and 48 will cause the spring pressed lug 56 to move downwardly from the pivoting recess 30, sliding over the portion 26 and ridge 29 as vthe body member 32 moves downwardly and the tap 66 enters the pilot hole. The body member 32 slides downwardly on the bar I0 and is maintained in 'alignment with it.

As the tapping operation proceeds through rotation of the handles 46 and 4B the tap 68 penetrates deeper into the pilot hole and the body member moves downwardly on the bar IB. There is no need to alter the position of the press I6 to compensate for this downward movement as the long bearing between bar ID and body member 32 permits the required downward tapping movement. It is apparent that during rotation of the handles while tapping, the bar IU and chuck I4 remain stationary and the body member 32 rotates freely around the bar I0.

On completion of the tapping operation the body member 32 is raised by the handles 46 and 48 until the lug 55 is again received in the pivoting recess 30 holding the body member 32 in raised position. Handle I8 may then be operated to raise the tapping tool for release from chuck I4.

With the device illustrated it will be seen that the tapping tool follows exactly` the` path of the drill or other tool whichmade the pilot holeI thus insuring a proper path of'movement of the tapping tool, preventing its being forced out of its proper path which would break or otherwise render the tapping tool 66 useless.

Y device shown, which are merely by way of illustration and not limitation as various and other forms of the device will, of course, be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims. A

1. In a. tapping m01, the combination of a body member comprising a socket member, a tubular member secured thereto `and.extending into said socket member terminating therein, a cross head secured to said tubular, member in 'spaced relation to said socket member, handles removably secured to saidv cross head in' .opposed axially aligned relation to eachother, the end of said tubular member within'said socket member having a shoulder, spring pressed lugsmovably disposed within said socket, on opposite sides of said shoulder urged diametrically of said socket member, said lugs being aligned axially of said socket member, a pivot bar having one end removably inserted into said-body memberV from the end opposite tojsaid socket member, said end of said v1pivot-bary within saidtubular member having a recess forreceiving one of said lugs whereby said body member is pivoted to said pivot bar, the inner diameter of'said tubular member 4being slightly greater than the outer diameter of said bar whereby a bearing is provided between said bar and body member, the opposite end of said bar being adaptedto be held in a chuck for positioning the tapping tool Aduring operation thereof, and an adapter provided with a tap, removably inserted into said socket member and provided with 'a shoulder` interlocked with said first named shoulder whereby rotation of said body member rotates said tap, said adapter having a recess -for receiving the other lug wherebyv said shoulders are held in interlocked position. Y,

. 2. In a tapping tool, the combination of a body member comprising a socket member, a tubular member secured thereto, a cross head secured to said ytubularinember in spaced relation to said socket member, handles removably' secured to said cross head in opposed -axiallyaligned relation to each other, a shoulder within vsaid socket member, spring pressed lugs movably .disposed within said socket member and urged toward the axis thereof,a pivot bar having one end inserted into said body member from the end-opposite to said socket member,- said end of said'pivot bar within said body member having a recess for receiving one of said lugs Wherebysaid body member is pivotedto sai-id pivot bar, the inner diameter of saidgtubular member being slightly greater than the outer diameter of said bar whereby Va bearing` is provided :between said bar and body member, the opposite end of said bar being adapted to be held in a chuck for positioning the tapping tool during operation thereof, and an adapter provided with a tap, said adapter being removably inserted into said socket member and provided with a shoulder interlocked with said rst named shoulder whereby rotation of said body member rotates said tap, said adapter having a recess for receiving the other lug whereby said shoulders are held in interlocked position.

3. In a tapping tool, the combination of a body member comprising a socket member, a tubular member secured thereto and extending into said socket member terminating therein, a cross head secured to said tubular member in spaced relation to said socket member, handles removably secured to said cross head in opposed axially aligned relation to each other, the end of said tubular member within said socket member having a shoulder, spring pressed lugs movably disposed Within said socket on opposite sides of said shoulder urged diametrically of said socket member, said lugs being aligned axially of said socket member, the spring of said spring pressed lugs comprising a leaf member secured to said socket member intermediate the ends of said leaf member, the lugs being secured to the ends of the leaf member, a pivot bar having one end removably inserted into said body member from the end opposite to said socket member, said end of said pivot bar within said body member having a recess for receiving one of said lugs whereby said body member is pivoted to said pivot bar, the inner diameter of said tubular member being slightly greater than the outer diameter of said bar whereby a bearing is provided between said bar and body member, the opposite end of said bar being adapted to be held in a chuck for positioning the tapping tool during operation thereof, and an adapter provided with a tap, said adapter being removably inserted into said socket member and provided with a shoulder interlocked with said first named shoulder whereby rotation of said body mem-ber rotates said tap, said adapter having a recess for receiving the other lug whereby said shoulders are held in nterlocked position,

4. In a tapping tool, the combination of a pivot bar having one end adapted to be fixed for positioning the tapping tool during operation thereof, a recess adjacent the other end of said bar, an elongated body member position in axial alignment with said bar and mounted for pivotal and longitudinal movement with respect thereto, a spring pressed lug carried by said body member for engaging said recess and releasably holding said body against longitudinal movement with respect to said bar, an adapter provided with a tap releasably fixed to said body member and means for rotating. said body member mounte thereon.

5. In a tapping tool, the combination of a body member, a tap-holding adapter member inserted into one end of said body member, a spring pressed lug on one of said members and a recess in the other of said members for releasably securing said members together, a pivot bar member having one end inserted in the other end of said body member, said body member being pivotally and axially movable with respect t0 said bar member, a spring pressed lug on one of said last named members and a recess in the other of said last named members for releasably and pivotally securing said members together, the opposite end of said bar member being adapted to be held in a chuck for positioning the tapping tool during operation thereof, and means for rotating said body member mounted thereon.

JOSEPH STARKEL.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 573,779 Gillespie Dec. 22, 1896 1,743,505 Tourgeon Jan. 14, 1930 1,862,337 Emmrick June 7, 1932 2,235,572 Culbertson Mar. 18, 1941 2,465,541 Kreshock Mar. 29, 1949 OTHER REFERENCES Publication, T001 and Die Journal, Oct. 1946. 

